The charming European hedgehog has an incredible ability to hear sounds at frequencies that far exceed those of humans, dogs, and cats. This newfound knowledge could play a crucial role in safeguarding these delightful creatures from the dangers of road traffic.
With their adorable appearance, it’s hard to imagine that one-third of hedgehog fatalities are caused by car accidents. This alarming statistic has led to the hedgehog being classified as “Near Threatened” by the IUCN due to the risk of localized extinctions, particularly in areas where car collisions are common.
Researchers from the University of Oxford have made an exciting discovery: hedgehogs can detect ultrasonic sound waves at frequencies as high as 85,000 hertz. For context, humans can hear up to 20,000 hertz, while dogs and cats can hear more, but none can compare to the hedgehog’s remarkable sensitivity.
In an innovative study conducted at a Danish rescue center, hedgehogs were exposed to short bursts of sound lasting up to 20 seconds. By using electrodes to monitor their brain activity, researchers found that these spiky animals are most responsive to sounds around 45 kHz, which is similar to the frequency of a dog whistle.
To further understand hedgehogs’ auditory capabilities, the study team combined their findings with micro-CT scans of a hedgehog that had been mortally injured. This analysis revealed that the structure of the hedgehog’s ear canal bears a resemblance to that of echolocating bats.
Professor David Macdonald, a co-author of the study, expressed his enthusiasm for the implications of this research, stating, “It is especially exciting when research motivated by conservation leads to a fundamental new discovery about a species biology which, full circle, in turn offers a new avenue for conservation.”
Dr. Sophie Lund Rasmussen, the study’s corresponding author, shared her intrigue regarding the potential uses of ultrasound by hedgehogs, saying, “A fascinating question now is whether they use ultrasound to communicate with each other, or to detect prey—something we have already begun investigating.”
In a proactive effort to protect hedgehogs, researchers are exploring the possibility of using ultrasonic sound emitters attached to cars, lawnmowers, and hedge trimmers as a means of keeping these animals safe. By emitting a sound only audible to the hedgehogs, such devices could potentially prevent them from venturing onto roads where they face danger.
The research team is currently seeking volunteers within the automotive industry to help fund and develop a prototype of this innovative repellent device to be tested on vehicles.
Let’s spread the word about this promising research to help save our beloved hedgehogs! Share this exciting news with your friends and family!
